A new Hg2+ colorimetric chemosensor: the synthesis of chromenodpyrimidine-2,5-dione/thione derivatives using Fe3O4@SiO2@(BuSO3H)(3)

摘要

The synthesis of chromeno[d]pyrimidine-2,5-dione/thione derivatives has been described by the reaction of aryl aldehydes, urea/thiourea, and 4-hydroxycoumarin using Fe3O4@SiO2@(BuSO3H)(3) as catalyst under microwave irradiation (MWI) in H2O. The sensing application of 4-(4-chlorophenyl)-3,4-dihydro-1H-chromeno[4,3-d]pyrimidine-2,5-dione 4b was examined upon addition of different cations by UV-Vis spectroscopy and exhibited excellent sensitivity towards Hg2+ ions by increasing the absorption. The UV-visible absorption spectral data showed good linearity between the UV-Vis absorption of chemosensor 4b and the concentration of Hg2+ with a detection limit of 3.76 x 10(-7) M. Furthermore, the chemosensor 4b exhibited an obvious color change from white to light pink in the presence of Hg2+ in EtOH solution.